Chemswab Presaturated Swabs are general purpose, lint-free alcohol cleaning swabs. Chemswab Presaturated Swabs contain ultra-pure isopropyl alcohol (91% IPA / 9% Pure Water) on a urethane foam swab. They are excellent for general purpose cleaning of computers, office and laboratory equipment. These highly effective cleaning swabs are ideal for cleaning sensitive surfaces, electronics components, touch keypads, keyboards, and instrument housings. Chemswab quickly and safely removes handling soils, dirt, and oxides from PCB’s, mechanical/electrical assemblies and other electronic equipment. Chemswab is especially effective in removing ink and permanent marker.